Pilot chart of the north Indian Ocean nautical chart

Shows prevailing wind direction by month.
"Series C. nos. 1 & 2."
The pilot charts were released as series C a part of Maury's "Wind and current charts", series A-F. These charts were designed for sailing ships and recorded wind direction observations made by mariners on previous voyages. For complete discussion, see "The wind and current chart series produced by Matthew Fontaine Maury," by Marc I. Pinsel, in Navigation : Journal of the Institute of Navigation, v. 28, no. 2 (Summer, 1981), p. 123-137.
Copy imperfect: Torn fold-lined with minor losses. Torn and repaired along right edge. Mounted on cloth.
Available also through the Library of Congress Web site as a raster image.